OK, let's work through this together. We're starting with 215 and we're going to multiply it by 98, which means we add 215 to itself 98 times.
Step 1: 0 + 215 = 215
Step 2: 215 + 215 = 430
Step 3: 430 + 215 = 645
Step 4: 645 + 215 = 860
Step 5: 860 + 215 = 1075
Step 6: 1075 + 215 = 1290
Step 7: 1290 + 215 = 1505
Step 8: 1505 + 215 = 1720
Step 9: 1720 + 215 = 1935
Step 10: 1935 + 215 = 2150
Step 11: 2150 + 215 = 2365
Step 12: 2365 + 215 = 2580
Step 13: 2580 + 215 = 2795
Step 14: 2795 + 215 = 3010
Step 15: 3010 + 215 = 3225
Step 16: 3225 + 215 = 3440
Step 17: 3440 + 215 = 3655
Step 18: 3655 + 215 = 3870
Step 19: 3870 + 215 = 4085
Step 20: 4085 + 215 = 4300
Step 21: 4300 + 215 = 4515
Step 22: 4515 + 215 = 4730
Step 23: 4730 + 215 = 4945
Step 24: 4945 + 215 = 5160
Step 25: 5160 + 215 = 5375
Step 26: 5375 + 215 = 5590
Step 27: 5590 + 215 = 5805
Step 28: 5805 + 215 = 6020
Step 29: 6020 + 215 = 6235
Step 30: 6235 + 215 = 6450
Step 31: 6450 + 215 = 6665
Step 32: 6665 + 215 = 6880
Step 33: 6880 + 215 = 7095
Step 34: 7095 + 215 = 7310
Step 35: 7310 + 215 = 7525
Step 36: 7525 + 215 = 7740
Step 37: 7740 + 215 = 7955
Step 38: 7955 + 215 = 8170
Step 39: 8170 + 215 = 8385
Step 40: 8385 + 215 = 8600
Step 41: 8600 + 215 = 8815
Step 42: 8815 + 215 = 9030
Step 43: 9030 + 215 = 9245
Step 44: 9245 + 215 = 9460
Step 45: 9460 + 215 = 9675
Step 46: 9675 + 215 = 9890
Step 47: 9890 + 215 = 10105
Step 48: 10105 + 215 = 10320
Step 49: 10320 + 215 = 10535
Step 50: 10535 + 215 = 10750
Step 51: 10750 + 215 = 10965
Step 52: 10965 + 215 = 11180
Step 53: 11180 + 215 = 11395
Step 54: 11395 + 215 = 11610
Step 55: 11610 + 215 = 11825
Step 56: 11825 + 215 = 12040
Step 57: 12040 + 215 = 12255
Step 58: 12255 + 215 = 12470
Step 59: 12470 + 215 = 12685
Step 60: 12685 + 215 = 12900
Step 61: 12900 + 215 = 13115
Step 62: 13115 + 215 = 13330
Step 63: 13330 + 215 = 13545
Step 64: 13545 + 215 = 13760
Step 65: 13760 + 215 = 13975
Step 66: 13975 + 215 = 14190
Step 67: 14190 + 215 = 14405
Step 68: 14405 + 215 = 14620
Step 69: 14620 + 215 = 14835
Step 70: 14835 + 215 = 15050
Step 71: 15050 + 215 = 15265
Step 72: 15265 + 215 = 15480
Step 73: 15480 + 215 = 15695
Step 74: 15695 + 215 = 15910
Step 75: 15910 + 215 = 16125
Step 76: 16125 + 215 = 16340
Step 77: 16340 + 215 = 16555
Step 78: 16555 + 215 = 16770
Step 79: 16770 + 215 = 16985
Step 80: 16985 + 215 = 17200
Step 81: 17200 + 215 = 17415
Step 82: 17415 + 215 = 17630
Step 83: 17630 + 215 = 17845
Step 84: 17845 + 215 = 18060
Step 85: 18060 + 215 = 18275
Step 86: 18275 + 215 = 18490
Step 87: 18490 + 215 = 18705
Step 88: 18705 + 215 = 18920
Step 89: 18920 + 215 = 19135
Step 90: 19135 + 215 = 19350
Step 91: 19350 + 215 = 19565
Step 92: 19565 + 215 = 19780
Step 93: 19780 + 215 = 19995
Step 94: 19995 + 215 = 20210
Step 95: 20210 + 215 = 20425
Step 96: 20425 + 215 = 20640
Step 97: 20640 + 215 = 20855
Step 98: 20855 + 215 = 21070

So, 215*98 = 21070